Ventilator



Nov. 10, 1931.

F. J. OBERMARK VENTILATOR Filed May 17; 1950 INVENTOR flunk J Obe rmar/c.

BY 747 TOPNEY Patented Nov. 10, 1931 UNITEDSTATES PATENTMOFFICE',

FRANK J. OBERMARK, OF s'r. LoUIs, MIssoUR 'AssI ivoR or rosary-NINE PER em To A. o. WIOKERT, or sr, LOUIS, MISSOURI VENTILATOR Application filed May 17, 1930. Serial N0. 453,231,

Myinvention has relation to improvements in ventilators and it consists in the novel fea tures of construction more fully set forth in the specification and pointed out in the claims.

51. The object of the present invention is to provide a ventilator for factories and similar types of buildings that is adapted to be mounted on the roof forthe purpose of drawing from the building noxious or other dis- I agreeable gases, for which purpose the ventilator comprises a short stack having a hood rotatably mounted thereover, within which are devices for accelerating the flow of the gases. A further object is provide suitable 1 lateral vents in the hood for the traverse of and increasing the efficiency of the ventilator. A further object is to provide a ventilator construction for accomplishing these results that is comparatively simple and inexpensive to build, and one possesing further and other advantages that will be better apparent from a detailed description of the invention in connection with the accompanying drawings, 111 wh1ch Fig. 3 is a vertical middle longitudinal section taken on the line 33 of Fig. 2; Fig. 4.- is top plan of the ventilator with parts broken away; and Fig. is an enlarged sectional detail of the anti-friction bearing and support therefor by means of which the hood is rotatably mounted on the ventilator stack. Referring to the drawings 1 represents a cylindrical stack having a rectangular base 2 within which lugs 3 are disposed at the corners for the purpose of securing the stack to the roof R of the building that is to be ventilated. Of course, the roof is provided with a vent opening 0 which allows the obi-ectionable gases to escape therefrom into the stack 1. Immediately belowthe inwardly turned topedge 4 of the stack 1 is a cross member 5 and a second cross member 6 is spaced there from, for the support of astaff 7 Which projects upwardly above thestack l. The staff. inTthe present instance is hollow and has a, plug 8 near its upper end between Which and the inwardly turned edgev 9 of the staff is loosely confined a ball 10, constituting together with edge 9a bearing for rotatably supporting the ventilatorhood H.

It is in. the hood H that .the invention resides, the stack audits necessary elements being old in the art. The hood comprises a 1 box-like structure having a skirt. 11 from which the rear wall -12 inclines upwardly as well as the triangular side walls 13, 13. The side walls 13, 13 extendforwardly beyond thefskirt 11 and are connected thereto by a ledge or shelf 14 which forms the lowermargin of theoutlet opening of the hood. The

top-15 of-the hood isjoined at its rear edge to the back 12, and inclines upwardlyslightly from the horizontal to its forward edge 16 which is the top margin of the hood outlet.

The hoodI-I has a-second pairof side walls 1 17, 17 formed integrally with the top and connected at the bottom of, their forward I Fig. 1 is a front elevation of my improved ventilator; Fig. 2 1s a rear elevation thereof;

edges 17, 17 to the shelf lhsaid forward edges forming the side margins of the outlet opening. It will be observed thatthe inner side walls 13, 13 converge slightly toward thetop and rear, and outer si dej'walls17, 17 diverge slightly towardthe rear ofthe hood so that spaces 8, s areformed between ad 19 on each side, joined along amedial' plane.

to form parting edges 20, .21 for the rising gases. .Therear defiectingsurfaces 18, 18

so jacentsidewalls 13and 17 which spaces are the are inclined upwardly and outwardly to divide the ascending gases into two streams and deflect these streams toward the inner side walls 13, 13 where they encounter the atmospheric currents passing from back to front of the hood through the spaces .9, .9. Because the front portion of the inner walls 13, 13 is cut away the divided gas currents will quickly enter the paths of the cross air currents.

A bearingplate- 22 is secured within: the hood H and takes the vertical thrust of th ehood upon the ball 10, and a confining.omem.- ber 23 having a perforation 23 extends downwardly from said plate stafi 7.

A vane 24 is mounted on the top 15 of the hood H towardv the front thereof for the purpose of causing the hoodto be rotated by; the atmospheric air currents so that the outlet opening' ofth'e hood will always :be away from-thewin'd Thus,'-the lback of the hood I will be turned into -the wind so that: at mospheri'c air currents will enter the spaces 8, s, heretofore-referred to,-(as shown in Fig; E

4) and traverse the hood: in paths adj acent' to 1 the side walls "13 and '17. T he" gases risingfi. through the stack 1 will be deflectedon encountering the partingedge 21 of the de flector D-and will be turned by thedeflectingl surfaces 18, 18 toward the opposite sides-of the "hood; Since 'th'e" forwardportions of the sidewalls 13, 13 are cut away, these uprising' gases will almostimmediately encounter cross-atmospheric currents passing through the hood and will be expelled there-- from. Thus, it will be seen" that I do not rely alone-upon the injector action of the atmospheric currents through the hood-but provide means for actually projecting the vented gases into the atmospheric cross-our rents-which serve as the vehicle for-remov ing'them. p Having descr'ibed my invention, I claim: 1. A ventilator comprising-a stack, a hood rotatably mounted on said stack and adapted to receive the gases passing therefrom, said' hood having an open front for-the discharge of said gases and inner and outer side walls, said inner side walls being spaced fromthe outer walls and the'hood open at the backbetween said spaced walls to permit'theflow of atmospheric current-s through said spaces,

the inner side walls havingfree upper'edges I inclining downwardly, toward the gas outlet of the hood, and a deflector within the hood for diverting'the uprising gases into the path of thecross-atmospheric currents. V

2. A ventilator comprising a stack, a hood rotatably mounted'on said stack and adapted to receive the gases passingthere'from, said hoodhaving an open front for the discharge ofsaid gases and inner and outer side walls;

,said inner side wallsbeing spaced from jthe" outenwalls, and thehoodope'natthe back and receives the? signature.

F -RANK .J." OBERMARK. 

